ML20129G724
| ML20129G724 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 05/17/1985 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| SD-414-85-05, SD-414-85-5, NUDOCS 8506070352 | |
| Download: ML20129G724 (2) | |
Text
DUKE POWER GOMPANY P.O. DOx 33180 CHAMLOTTE. N.O. 28242 HAL H. TUCKER Tetzpuomu pg.38 May 17, 1985
~ ~ ~ "
ag.g te Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 RE: Catawba Nuclear Station, Unit 2 Docket Nos. 50-414 Significant Deficiency No. 414/85-05
Dear Dr. Grace:
Pursuant to 10CFR 50.55(e), please find attached Significant Deficiency Report No. 414/85-05.
Very truly yours, b.
/ $)
Hal B. Tucker LTP/mj f Attachment cc: Director Mr. Robert Guild, Esq.
Office of Inspection and Enforcement Attorney-at-Law U. S. Nuclear Regulatory Commission P. O. Box 12097 Washington, D. C. 20555 Charleston, South Carolina 29412 NRC Resident Inspector Mr. Jesse L. Riley Catawba Nuclear Station Carolina Environmental Study Group Palmetto Alliance 854 Henley Place 213511 Devine Street Charlotte, North Carolina 28207 Columbia, South Carolina 29205 INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 oeo
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Report Number: SD 414/85-05 Report Date:
May 17, 1985 Identification of Deficiency:
A potential' problem may exist with the starting air check valves in the on-engine mounted starting air piping.
At another. utility, a piece of the check valve broke off and passed through the air start valve, and was found on top of a piston crown. A second check valve was inspected and found to be cracked.
Initial Report:
On April 19, 1985, Mr. Hugh Dance of the NRC, Region II, Atlanta, Georgia of fice was notified of this potential deficiency by Mr. L. M. Coggins. Mr. N. A.
Rutherford, Mr. R. O. Sharpe, Mr. T. L. Utterback, and Mr. J. 14. Lines of Duke Power Company, Charlotte, North Carolina 28242.
Supplier and/or Component:
Transamerica Delaval,Inc. of Oakland, California supplied the four diesel generators, designated 1A, 1B, 2A and 2B, utilized at the Catawba Nuclear Station.
The Clow Corporation of Oskaloose, Iowa manufactured the valves.
Description of Deficiency:
A potential problem may exist with the starting air check valves in the on-engine mounted starting air piping. There are four of these valves on each Catawba diesel.
At another utility, a piece of the check valve (3/8".dia. x 7/8" length) broke off and passed through the air start. check' valve, and was found on top of a piston crown. A second check valve was inspected, and found to be cracked. The third and forth valves were inspected, and no other indications were found.
Analysis of Safety' Implication:
If the check! valves are damaged, it could compromise the operability of the diesels.
Corrective Action:
An inspection of three of the four diesel engines (12 valves out of 16) at Catawba has shown no indications of' check valve failure. The Unit 1-diesels have logged in excess of 800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> of operation, with no signs of. check valve problems.
Based on these facts, the redundancy of the diesels, and our periodic inspection program, no immediate corrective action is planned. The remaining diesci 1B is scheduled for inspection during the Unit 1 first refueling outage.
We are investigating the failure mechanism for these check valves. The results of this analysis wi11' determine the final course of action.
Resolution will be reached and-a final report submitted by January 30, 1986.